Typical layup for a kayak like this would be 200g carbon, foam core, 200g carbon with added reinforcement where needed for example the nose and the cockpit area. I believe that the deck and hull are joined using some sort of lap joint and bonded together, finishing off the seam with gelcoat and a seam tape of glass or kevlar flat braid.
Infusion spiral and pump I'm sure someone else has better knowledge than me but it can be easily done with hand layup and bagging after to get a kayak around 10kg of this sort.
Spiral I would guess runs down the centre line of the hull for resin inlet and a ring around the flange to draw resin towards the pump evenly. Any pump (within reason) that will draw close to full vacuum will be appropriate for this.
Hope this helps, I can take some pictures the next time we build some racing kayaks and post them up if I remember to show how we seam them.
Tom